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Finding the Third Proportional to 263.25 and 408.80

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Solution

The third proportional to 263.25 and 408.80 is: 634.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    263.25 : 408.80 = 408.80 : x
  2. Step 2: Convert to fraction form
    263.25/408.80 = 408.80/x
  3. Step 3: Cross multiply
    263.25x = 408.80 × 408.80
  4. Step 4: Simplify right side
    263.25x = 167,114.89
  5. Step 5: Solve for x
    x = 167,114.89/263.25
  6. Step 6: Final answer
    x = 634.81

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.